摘要
利用黑臭河道模拟装置,对比研究了在静置和人工曝气2种方式下底泥污染释放特征及对上覆水水质的影响。结果表明,与静置释放相比,人工曝气促使实验前期底泥污染物快速释放,使得上覆水体中的各项污染物指标上升;随着水体中DO浓度的增加,硝化细菌、嗜磷菌等好氧细菌的活性增强,水体中的COD、氨氮、TN和TP得到降解或转化,浓度快速下降。实验期内,人工曝气底泥中TN、TP的平均释放速率分别为:-0.11 g/(m2·d)和-0.02 g/(m2·d),并且TP由最初的0.96 mg/L降到最终的0.48 mg/L,去除率达到50.00%。人工曝气在前期对水体中各污染指标有升高的影响,但增加了水体中的DO浓度,可以有效地抑制底泥中氮和磷的释放,对水体有机污染物、TN及TP有一定的削减作用,因此,该技术适合黑臭河道的水体修复。
The characteristics of sediment release and its effects on overlying water quality were researched by two simulation devices under static and aerated conditions. The results revealed that compared with the static release condition,the artificial aeration accelerated the release rate of the river sediment in the early stage,and made pollutants indexes rapidly increased. Due to the increase of the concentration of DO in water,the activity of the aerobic bacteria was enhanced to promote the degradation or transformation of COD,NH＋4-N,TN and TP in water. Under the artificial aeration condition,the average release rates were- 0. 11 g /（ m2·d） and- 0. 02 g /（ m2·d） for TN and TP,respectively. The concentration of TP decreased from 0. 96 mg /L to 0. 48 mg /L,and the removal rate was 50. 00%. Each pollutant index of overlying water in the early stage increased under artificial aeration condition. While the DO value raised,the release rates of TN and TP from the river sediment were effectively inhibited,and furthermore,the organic pollutants were controlled and reduced. Therefore,the artificial aeration method can be utilized in the remediation of the black-odor rivers.
出处
《环境工程学报》
CAS
CSCD
北大核心
2015年第11期5249-5254,共6页
Chinese Journal of Environmental Engineering
基金
"十二五"国家科技支撑计划项目(2012BAJ21B08)
关键词
人工曝气
底泥
污染物释放
上覆水
artificial aeration
sediment
pollutants release
overlying water
